Silencer inner pipe circle forming device

Abstract

The utility model relates to the technical field of dies, and provides a silencer inner pipe ring round die forming device which comprises a top plate, a die holder and a die holder. The upper die is fixed to the top plate and provided with a semi-circular groove and a V-shaped flaring extending from the semi-circular groove; the bottom die is provided with a C-shaped cavity and a slope adjacent to the C-shaped cavity; at least one part of the shaft core is cylindrical; the bottom die is fixed on the fixed seat; the fixed seat is fixed to the bottom plate; wherein the semicircular groove of the upper die is matched with the outline of the C-shaped cavity of the bottom die, and the V-shaped flaring of the upper die is matched with the outline of the slope of the bottom die. According to the utility model, the condition of single-side inclination of the shaft core when the round die is circled is prevented; and meanwhile, the situation that the circling effect is not ideal due to axial crowding of the inner pipe can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a mould technical field, specifically a muffler inner pipe ring circle mould forming device. BACKGROUND

[0002] For the airflow pipe with noise propagation, the muffler can be used for noise reduction. At present, the pipeline and elbow with sound absorption lining or other noise reduction devices such as pipeline with sudden change of cross-sectional area and other acoustic impedance discontinuity can be used to make the noise in the pipeline attenuate or reflect. The former is called resistive muffler, and the latter is called resistive muffler. There is also a complex impedance muffler.

[0003] Chinese patent document CN205096380U discloses a muffler inner pipe stamping die, which comprises an upper die plate and a lower die plate, a convex die fixing plate is arranged on the lower end face of the upper die plate, a convex die is arranged on the lower end face of the convex die fixing plate, a core shaft is arranged in the convex die, the two ends of the core shaft are connected with the lower end face of the convex die fixing plate through the core shaft fixing plate, and a concave die matched with the convex die is arranged on the lower die plate.

[0004] The muffler inner pipe stamping die in the above patent adopts two J-shaped grooves to stamp and form the U-shaped plate, although the circle action can be realized, but the roundness of the muffler inner pipe cannot be guaranteed by simply relying on the pressure between the convex die and the concave die, and the axial accumulation situation may occur, so that the pressure of the two ends of the round pipe is unbalanced, and the closing effect of the round pipe is not ideal. UTILITY MODEL CONTENTS

[0005] The utility model discloses a kind of muffler inner pipe ring circle mould forming device, when upper die and bottom die are closed, muffler inner pipe ring circle can be realized under the cooperation of shaft core, this circle mode can guarantee the roundness of round pipe, guarantee the tightness of the edge closed at the two ends of U-shaped plate;Under the cooperation of two nitrogen gas springs, the pressure balance of the two ends of round pipe can be guaranteed, and the axial accumulation situation can also be prevented from occurring. To solve the technical problems raised in the above background art.

[0006] To achieve the above object, the utility model provides a kind of muffler inner pipe ring circle mould forming device, it includes: roof;Upper die, it is fixed to roof, and has semicircular groove and V-shaped flared from semicircular groove;Bottom die, it has C-shaped cavity and slope adjacent to C-shaped cavity;Shaft core, at least a portion thereof is cylindrical;Fixed seat, the bottom die is fixed to fixed seat;And bottom plate, the fixed seat is fixed to bottom plate;Wherein the semicircular groove of upper die and the C-shaped cavity profile cooperation of bottom die, and the V-shaped flared of upper die and the slope profile cooperation of bottom die.

[0007] In some embodiments, the shaft core has a cylindrical portion at a first end and flat top and bottom surfaces at a second end.

[0008] In some embodiments, the cylindrical part of the first end of the shaft core is fixedly connected to a mounting block, the mounting block has a hole matched with a sliding column arranged on a fixed seat, and one or more second springs are arranged between the mounting block and the fixed seat.

[0009] In some embodiments, a nitrogen spring fixed to a top plate is arranged above the mounting block.

[0010] In some embodiments, a nitrogen spring fixed to a top plate is arranged above the flat top surface of the second end of the shaft core, and a first spring is arranged below the flat bottom surface of the second end of the shaft core.

[0011] In some embodiments, a guide seat, a guide column and a mounting seat are arranged between the top plate and the bottom plate, wherein the guide seat is fixed to the top plate and in sliding connection with the guide column, the guide column is fixed to the mounting seat, and the mounting seat is mounted on the bottom plate.

[0012] In some embodiments, a plurality of L-shaped limiters are arranged on both sides of the bottom die, and the limiters are fixed to the fixed seat.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] 1. The utility model discloses a U-shaped plate is placed in the C-shaped groove above the bottom die, and the upper end of the U-shaped plate is located on both sides of the shaft core, so that the inner tube can be formed in a circle when the upper die is pressed down, and the roundness of the inner tube when being formed in a circle can be improved under the cooperation of the shaft core.

[0015] 2. The nitrogen spring can balance the two ends of the shaft core, prevent the shaft core from tilting on one side when the circle forming die is used, and avoid the inner tube from being axially accumulated to cause an unsatisfactory circle forming effect.

[0016] 3. The first spring and the second spring are stripping springs, which can balance when the inner tube is formed in a circle, and can lift the mounting block after the circle forming is completed, so that the inner tube can be stripped from the shaft core.

[0017] 4. The nitrogen spring has a gap between the lower end and the shaft core, so that the inner tube can be easily stripped from the shaft core. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the three-dimensional structure of the utility model.

[0019] Figure 2 is a schematic diagram of the rear side structure of the utility model Figure 1 .

[0020] Figure 3is the front view of the utility model Figure 1 .

[0021] Figure 4 is the A-A section view of the utility model Figure 3 .

[0022] Figure 5 is the local enlarged schematic view of the utility model Figure 4 .

[0023] In the drawing: 1 - bottom plate, 2 - fixed seat, 3 - mounting seat, 4 - guide column, 5 - guide seat, 6 - top plate, 7 - nitrogen spring, 8 - mounting block, 9 - upper die, 10 - shaft core, 11 - bottom die, 12 - limiting piece, 13 - first spring, 14 - second spring, 15 - slide column. DETAILED DESCRIPTION

[0024] The technical scheme in the embodiments of the utility model will be apparently and completely described below with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the protection scope of the utility model.

[0025] Please refer to Figures 1-5 , in the embodiments of the utility model, a sound absorber inner pipe ring circle die forming device, including the upper die 9 and bottom die 11 for the sound absorber inner pipe ring circle, the shaft core 10 of auxiliary circle is arranged between the upper die 9 and bottom die 11, one end of the shaft core 10 is arranged in a cylindrical shape, and the other end top and bottom are provided with planes respectively contacting the nitrogen spring 7 and the first spring 13, the bottom of the upper die 9 has a semicircular groove 910 and a V-shaped flared 920 extending from the semicircular groove 910, the bottom die 11 has a C-shaped cavity 112 and a slope 110 near the C-shaped cavity 112, wherein the semicircular groove 910 and the C-shaped cavity 112 cooperate with the shaft core 10 to form the circle of the workpiece (U-shaped plate) when the upper die 9 and the bottom die 11 are closed or contacted, the V-shaped flared 920 and the slope 110 are beneficial to guide the closure of the upper die 9 and the bottom die 11, and prevent the two ends of the U-shaped plate from being undesirably deflected.

[0026] By adopting the above technical scheme, when using, the arc-shaped part of the U-shaped plate is placed in the C-shaped groove above the bottom die 11, and the upper end of the U-shaped plate is located on both sides of the shaft core 10, when the upper die 9 is pressed down, the circle forming of the inner pipe can be realized, and the roundness when the inner pipe is circled can be improved under the cooperation of the shaft core 10.

[0027] In the embodiments, the cylindrical end of the shaft core 10 is fixed in the mounting block 8, and the mounting block 8 is fixedly connected with the top plate 6 through the nitrogen spring 7.

[0028] By adopting the technical scheme, the nitrogen spring 7 (also referred to as a balance nitrogen spring) can balance the shaft core 10 at both ends, prevent the shaft core 10 from being inclined on one side when the circle is formed, and avoid the axial accumulation of the inner tube to cause the circle forming effect to be unsatisfactory.

[0029] In the embodiment, the nitrogen spring 7 is provided with two nitrogen springs 7, and the nitrogen spring 7 provided on one side of the first spring 13 is fixedly connected with the top plate 6, and a gap is reserved between the lower end of the nitrogen spring 7 and the shaft core 10.

[0030] By adopting the technical scheme, the gap is reserved to facilitate the inner tube to be separated from the shaft core 10.

[0031] In the embodiment, the mounting block 8 is slidably connected with the plurality of slide columns 15, the plurality of slide columns 15 are fixedly connected with the fixed seat 2, and the plurality of second springs 14 are further arranged between the mounting block 8 and the fixed seat 2.

[0032] By adopting the technical scheme, the first spring 13 and the second spring 14 are material separation springs, can balance when the circle is formed, and can lift the mounting block 8 after the circle forming is completed, so that the inner tube is separated from the shaft core 10.

[0033] In the embodiment, the bottom of the top plate 6 is diagonally provided with two guide seats 5; the guide seat 5 is slidably connected with the guide column 4; and the guide column 4 is fixed in the mounting seat 3, and the mounting seat 3 is bolted on the bottom plate 1.

[0034] By adopting the technical scheme, the guide seat 5 slides downward along the guide column 4 when the stamping is performed, and the accuracy of the circle forming of the upper die 9 and the bottom die 11 is ensured.

[0035] In the embodiment, the bottom die 11 is bolted on the fixed seat 2; the fixed seat 2 is bolted on the bottom plate 1; the two sides of the bottom die 11 are further provided with a plurality of L-shaped limit pieces 12; and the limit piece 12 is connected with the fixed seat 2 by bolts.

[0036] By adopting the technical scheme, the limit piece 12 can prevent the bottom die 11 from sliding laterally when the circle is formed, and has good fixing effect on the bottom die 11.

[0037] The working principle of the utility model is: when stamping, the arc part of the U-shaped plate is placed in the C-shaped groove above the bottom die 11, the upper end of the U-shaped plate is located on both sides of the shaft core 10, under the cooperation of the press, the guide seat 5 will slide downward along the guide column 4, the upper die 9 presses down the upper end of the U-shaped plate, because the bottom of the upper die 9 has a V-shaped cavity, a semicircular groove is opened through the top of the V-shaped cavity, the U-shaped plate can be accurately guided into the semicircular groove, so that the U-shaped plate is stamped and the circle forming of the inner tube is realized, under the cooperation of the shaft core 10, the roundness when the inner tube is formed can be improved; the setting of the nitrogen spring 7 can balance the both ends of the shaft core 10, prevent the shaft core 10 from appearing one-side inclination when the circle die is used; meanwhile, the situation that the circle effect of the inner tube is not ideal due to the axial accumulation of the inner tube can also be avoided.

[0038] The first spring 13 and the second spring 14 are material removal springs, which can balance when the circle forming is used, and can lift the mounting block 8 after the circle forming is completed, because the gap is reserved between the lower end of the nitrogen spring 7 and the shaft core 10, the inner tube can be easily removed from the shaft core 10.

[0039] For those skilled in the art, it is obvious that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims rather than the above description, therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any figure mark in the claims should not be regarded as limiting the involved claims.

[0040] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, the description manner of the specification is only for the sake of clarity, the skilled person should regard the specification as a whole, and the technical solutions in each embodiment can also be combined to form other embodiments that the skilled person can understand.

Claims

1. A muffler inner tube ring round die forming device, characterized by, Comprise: a top plate; an upper die fixed to the top plate and having a semicircular groove and a V-shaped flared portion extending from the semicircular groove; a bottom die having a C-shaped cavity and a slope adjacent to the C-shaped cavity; a shaft core, at least a portion of which is cylindrical; a fixed seat, the bottom die being fixed to the fixed seat; and a bottom plate, the fixed seat being fixed to the bottom plate; wherein the semicircular groove of the upper die and the C-shaped cavity of the bottom die are profiled to match each other, and the V-shaped flared portion of the upper die and the slope of the bottom die are profiled to match each other. The shaft core has a cylindrical portion at a first end and a flat top surface and a flat bottom surface at a second end.

2. The muffler inner tube ring circular molding apparatus according to claim 1, wherein The cylindrical portion of the first end of the shaft core is fixedly connected to a mounting block, the mounting block having a hole matched with a sliding column arranged on the fixed seat, and one or more second springs are arranged between the mounting block and the fixed seat.

3. The muffler inner tube ring circular molding apparatus according to claim 2, wherein A nitrogen gas spring fixed to the top plate is arranged above the mounting block.

4. The muffler inner tube ring circular molding apparatus according to claim 3, wherein A nitrogen gas spring fixed to the top plate is arranged above the flat top surface of the second end of the shaft core, and a first spring is arranged below the flat bottom surface of the second end of the shaft core.

5. The muffler inner tube ring circular molding apparatus according to claim 2, wherein A guide seat, a guide column and a mounting seat are arranged between the top plate and the bottom plate, wherein the guide seat is fixed to the top plate and is in sliding connection with the guide column, the guide column is fixed to the mounting seat, and the mounting seat is mounted on the bottom plate.

6. The muffler inner tube ring circular molding apparatus according to claim 1, wherein A plurality of L-shaped limiters are arranged on both sides of the bottom die, and the limiters are fixed to the fixed seat.

7. The muffler inner tube ring circular molding apparatus according to claim 1, wherein ​

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